# Wrong spark plugs

**URL:** <https://community.cartalk.com/t/wrong-spark-plugs/130147>\
**Category:** Maintenance/Repairs\
**Created:** [December 3, 2018, 9:35pm UTC](https://community.cartalk.com/t/wrong-spark-plugs/130147 "2018-12-03T21:35:58Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Fraz\_Qamar](https://avatars.discourse-cdn.com/v4/letter/f/ea5d25/32.png) [@Fraz\_Qamar](https://community.cartalk.com/u/Fraz_Qamar)\
**Post date:** [December 3, 2018, 9:35pm UTC](https://community.cartalk.com/t/wrong-spark-plugs/130147/1 "2018-12-03T21:35:58Z")

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hi guys  
for my skoda fabia i have changed the spark plugs but i think those were wrong, bought from amazon. those are for LPG CNG cars instead of petrol. since then my car is sluggish. is this the reason car is not accelerating.

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**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\
**Post date:** [December 3, 2018, 10:03pm UTC](https://community.cartalk.com/t/wrong-spark-plugs/130147/2 "2018-12-03T22:03:41Z")

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> [@Fraz\_Qamar](#):
>
> since then my car is sluggish. is this the reason car is not accelerating

Cause and effect… could very well be a reason. Swap them to the correct plug. don’t depend on Amazon to tell you if it is the right spark plug, their search engine for auto parts is pretty poor - as you found!

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**Author:** ![shanonia](https://avatars.discourse-cdn.com/v4/letter/s/9de053/32.png) [@shanonia](https://community.cartalk.com/u/shanonia)\
**Post date:** [December 3, 2018, 10:34pm UTC](https://community.cartalk.com/t/wrong-spark-plugs/130147/3 "2018-12-03T22:34:24Z")

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Yes. Almost always the best plugs are the ones specified by the carmaker when the car was new. Anything else is an experiment and quite possibly a mistake.

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**Author:** ![donnaeastman](https://avatars.discourse-cdn.com/v4/letter/d/e0b2c6/32.png) [@donnaeastman](https://community.cartalk.com/u/donnaeastman)\
**Post date:** [January 16, 2019, 9:57am UTC](https://community.cartalk.com/t/wrong-spark-plugs/130147/4 "2019-01-16T09:57:09Z")

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**If** it protrudes too far into the combustion chamber in an interference engine, the physical damage caused **to** the piston crown **can** be very serious. **If** the **plug used** is of a higher heat range, then **you will** experince starting difficulties and higher fuel compsumption.

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**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\
**Post date:** [January 16, 2019, 10:17am UTC](https://community.cartalk.com/t/wrong-spark-plugs/130147/5 "2019-01-16T10:17:08Z")

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> [@donnaeastman](#):
>
> **If** it protrudes too far into the combustion chamber in an interference engine

Doesn’t matter if it is an interference engine. Can happen to ANY engine, interference or not. “Interference engine” is a description of valve clearance if the timing belt or chain breaks.

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**Author:** ![It\_s-Me](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/it_s-me/32/12660_2.png) [@It\_s-Me](https://community.cartalk.com/u/It_s-Me)\
**Post date:** [January 16, 2019, 11:41am UTC](https://community.cartalk.com/t/wrong-spark-plugs/130147/6 "2019-01-16T11:41:52Z")

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> [@donnaeastman](#):
>
> **If** the **plug used** is of a higher heat range, then **you will** experince starting difficulties and higher fuel compsumption.

Heat range has nothing to do with how hot the spark is, that’s controlled by the gap, heat range is how fast/slow a spark plug dissipates heat.